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Efficient near ultraviolet light induced formation of hydrogen by ferrous hydroxideA possible origin of early hydrogen by UV-induced photoreduction of ferrous ions was investigated by measuring the rate of H2 formation from irradiated FeSO4 solutions as a function of pH and the range of UV sources. It was found that, in addition to the known reaction in acid solution which decreases in yield with increasing pH and requires far-UV light, there is an efficient reaction occurring between pH 6 and 9 which utilizes near-UV light (of a 200-W mercury arc lamp). This latter reaction is a linear function of both the concentration of Fe(2+) and the light intensity. These results support the suggestion of Braterman et al. (1983) that the near-UV-driven photooxidation of ferrous ions may be responsible for the origin of the banded iron formations on the early earth. The efficient photoreaction could also explain the source of reducing equivalents for CO2 reduction.
Document ID
19870066555
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Borowska, Zofia K.
(Rockefeller Univ. New York, NY, United States)
Mauzerall, David C.
(Rockefeller University New York, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Origins of Life
Volume: 17
Issue: 3-4
ISSN: 0302-1688
Subject Category
Geophysics
Accession Number
87A53829
Funding Number(s)
CONTRACT_GRANT: NAGW-321
Distribution Limits
Public
Copyright
Other

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